linux-kernel - Re: [PATCH] powerpc: cputime: fix a compile warning

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Message-ID: <1480708489.3947.3.camel@buserror.net>
Date:   Fri, 02 Dec 2016 13:54:49 -0600
From:   Scott Wood <oss@...error.net>
To:     Michael Ellerman <mpe@...erman.id.au>, yanjiang.jin@...driver.com,
        benh@...nel.crashing.org, paulus@...ba.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        jinyanjiang@...il.com
Subject: Re: [PATCH] powerpc: cputime: fix a compile warning

On Fri, 2016-12-02 at 15:15 +1100, Michael Ellerman wrote:
> yanjiang.jin@...driver.com writes:
> 
> > 
> > diff --git a/arch/powerpc/include/asm/cputime.h
> > b/arch/powerpc/include/asm/cputime.h
> > index 4f60db0..4423e97 100644
> > --- a/arch/powerpc/include/asm/cputime.h
> > +++ b/arch/powerpc/include/asm/cputime.h
> > @@ -228,7 +228,8 @@ static inline cputime_t clock_t_to_cputime(const
> > unsigned long clk)
> >  	return (__force cputime_t) ct;
> >  }
> >  
> > -#define cputime64_to_clock_t(ct)	cputime_to_clock_t((cputime_t)(ct
> > ))
> > +#define cputime64_to_clock_t(ct)	\
> > +	(__force u64)(cputime_to_clock_t((cputime_t)(ct)))
> Given the name of the function is "cputime64 to clock_t", surely we
> should be returning a clock_t ?

That was my initial reaction but it seems that this function has meant "return
a u64 that is otherwise like clock_t" since before the beginning of git
history.  Both generic implementations return u64, including
jiffies_64_to_clock_t which does so explicitly.

-Scott